Distance R_• to the density centre of the GC of the ten most massive SBHs and the IMBH (solid black line). Strong interactions of the SBHs lead to ejection of four of them before the IMBH merges. They are removed from the simulation when R_• > 10 pc and they are unbound from the GC. At T ~ 47.7 Myr the IMRI leads to a coalescence that kicks the resulting merged system off the GC.